Liner
An AI research and search assistant with a web, PDF and YouTube highlighter. Ask a question and it returns cited answers, then lets you save and organise sources into collections. Free tier plus Pro around $15-18/month; it draws on models like GPT and Claude.
Work at Liner? Manage this listing
Our take
Liner is an AI research and search assistant with a handy web/PDF/YouTube highlighter - ask a question and it returns cited answers, then lets you save and organise sources into collections. Free tier plus Pro around $15-18/month. It draws on models like GPT and Claude. Search and research tools are crowded (Perplexity, You.com, Elicit); the highlighting and source management set it apart.
Best for
Students, researchers and knowledge workers who want cited AI answers plus a way to highlight, save and organise sources across the web.
Pros
- Cited AI answers backed by models like GPT and Claude
- Highlighter works across web pages, PDFs and YouTube
- Saves and organises findings into tagged collections
- Easy to start - browser extension plus web app, with a free tier
Cons
- Answer quality varies and still needs fact-checking
- Crowded space - overlaps with Perplexity, You.com and Elicit
- Heaviest AI-agent usage is gated to higher-priced tiers
How it compares
Against Perplexity and You.com, Liner's differentiator is research workflow - highlighting across sources and organising them into collections, not just returning an answer.
Full review
Liner is an AI search and research assistant wrapped around a highlighter. Ask a question and it returns an answer with citations, drawing on models such as GPT and Claude; the part that sets it apart is the ability to highlight passages across web pages, PDFs and even YouTube, then file everything into tagged collections you can come back to.
There is a free tier with daily limits, and paid plans land around $15-18/month, with higher tiers unlocking more AI-agent usage. It is a genuinely useful workflow for literature reviews and deep reading, but it sits in a crowded field next to Perplexity, You.com and Elicit, and like all of them its answers are a starting point that still needs checking against the underlying sources.
Cloudkart Trust Graph
3.8/5- Actual Utility4/5
Source: Initial LLM-authored rubric (backfill)
- Ease of Use5/5
Source: Initial LLM-authored rubric (backfill)
- Pricing Fairness4/5
Source: Initial LLM-authored rubric (backfill)
- Reliability3/5
Source: Initial LLM-authored rubric (backfill)
- Differentiation3/5
Source: Initial LLM-authored rubric (backfill)
Scored as of . Each score is versioned and auditable; vendors cannot buy it.
How this score is set
- Editorial rubric
- Primary signal — five dimensions, 3.8/5 average.
- Community reviews
- None yet.
- Pricing verified
- Not yet verified
- Independence
- Score set by our editorial team before any affiliate relationship is considered. No vendor can buy it.
Frequently asked questions
- Is Liner free, and how much does it cost?
- Liner has a free tier, with paid plans that unlock advanced features.
- Who is Liner best for?
- Students, researchers and knowledge workers who want cited AI answers plus a way to highlight, save and organise sources across the web.
- How is Liner rated on Cloudkart.ai?
- Liner scores 3.8 out of 5 on the Cloudkart.ai rubric, which weighs actual utility, ease of use, pricing fairness, reliability and differentiation. Scores are set editorially and can never be bought.
Community reviews
No community reviews yet. Be the first to share how Liner works for you.
Relevant tools
More tools in Data & Analytics AI.
Streamlit
Open-source Python framework for building and sharing interactive data and AI/ML apps with minimal front-end code.
Langfuse
Langfuse is an open-source AI engineering platform for building and operating LLM applications. It brings together observability and tracing, evaluations, prompt management, datasets, an annotation workflow and a prompt playground, and integrates with OpenTelemetry, LangChain, the OpenAI SDK, LiteLLM and more. A Y Combinator (W23) company, it moved every product feature to the MIT license in 2025, so the only commercial pieces are thin enterprise-compliance add-ons such as SCIM, audit logs and project-level RBAC. The cloud free tier covers 50,000 units a month, with a $29/month Core plan for production traffic and higher tiers for longer retention and SOC 2/ISO reports. In January 2026 ClickHouse acquired Langfuse and publicly committed to keeping the MIT license and avoiding new pricing gates.
Metabase
Open-source business-intelligence and embedded-analytics tool with a no-code query builder usable with or without SQL.
Lightdash
AI-first, open-source BI platform that is dbt-native, reading metric definitions directly from your dbt project.
Compare Liner head-to-head: vs Streamlit · vs Langfuse · vs Metabase · vs Lightdash